Measuring gripper unit and stretching unit

Abstract

A measuring gripper unit is disclosed having a base body, at least one guide element and at least one clamping device. The clamping device is arranged on the base body and configured to clamp a material web. The guide element is also located on the base body and configured to guide the measuring gripper unit on a guide rail. Furthermore, the measuring gripper unit includes a sensor device which is configured to capture measurement data during the operation of the measuring gripper unit 100 in a stretching unit.

1 . A measuring gripper unit for a stretching unit, comprising:
 a base body, at least one guide element and at least one clamping device,   wherein at least one clamping device is arranged on the base body and configured to clamp a material web;   wherein at least one guide element is arranged on the base body and is configured to guide the measuring gripper unit on a guide rail; and   wherein the measuring gripper unit comprises a sensor device which is configured to capture measurement data during the operation of the measuring gripper unit in a stretching unit.   
     
     
         2 . The measuring gripper unit according to  claim 1 , wherein the sensor device comprises a data storage unit for storing the captured measurement data and/or a transmitter unit for wireless sending of the captured and/or stored measurement data. 
     
     
         3 . The measuring gripper unit according to  claim 1 , wherein the sensor device comprises at least one of the following sensors:
 a temperature sensor,   a force sensor, a strain gauge, or a piezoelectric sensor,   an acceleration sensor,   a hall-effect sensor.   
     
     
         4 . The measuring gripper unit according to  claim 1 , wherein the sensor device is configured to detect a force acting on said at least one guide element, in a direction of travel (L) and/or in a direction (P) that is transverse to the direction of travel (L) of the measuring gripper unit. 
     
     
         5 . The measuring gripper unit according to  claim 1 , wherein said at least one guide element comprises a slide element or a guide roller. 
     
     
         6 . The measuring gripper unit according to  claim 5 , wherein
 the sensor device comprises at least one compressive force sensor, in particular a piezoelectric sensor, and wherein   the compressive force sensor is arranged between the base body and the slide element, and is configured to detect a force in a direction (P) that is transverse to the direction of travel (L) of the measuring gripper unit, or wherein   the sensor device comprises at least one force sensor, in particular a strain gauge, and wherein the force sensor is assigned to a guide roller and is configured to detect a radial force and/or an axial force.   
     
     
         7 . The measuring gripper unit according to  claim 1 , wherein the sensor device is configured to detect a tensile force of a clamped material web on the clamping device. 
     
     
         8 . The measuring gripper unit according to  claim 1 , wherein the base body is configured furthermore to be connected to a chain link and/or wherein
 the measuring gripper unit comprises at least one chain link, wherein the base body is connected fixedly to at least one chain link, and wherein   the sensor device is configured to detect a force acting on said at least one chain element, in a direction of travel (L) and/or in a direction (P) that is transverse to a direction of travel (L) of the measuring gripper unit.   
     
     
         9 . The measuring gripper unit according to  claim 8 , wherein at least one force sensor is arranged on the chain link, wherein
 a first force sensor is able to be located on a first link plate of the chain link, and/or wherein   a second force sensor is able to be located on a second link plate of the chain link, wherein the chain link is in particular an inner chain link.   
     
     
         10 . The measuring gripper unit according to  claim 1 , wherein the sensor device comprises furthermore a timer,
 wherein the sensor device is configured to capture, to store and/or to send a chronological course of the measurement data, and   wherein the sensor device is configured to send the course of the measurement data during operation of the measuring gripper unit.   
     
     
         11 . The measuring gripper unit according to  claim 1 , wherein the sensor device is configured to capture the measurement data with a frequency of at least 2 kHz or at least 2.5 kHz or at least 3 kHz and/or wherein the
 sensor device is configured to capture at least four different measurement data parallelly.   
     
     
         12 . The measuring gripper unit according to  claim 1 , wherein the sensor device is a temperature-resistant sensor device so that
 the sensor device captures measurement data during operation of the measuring gripper unit in the stretching unit, wherein the operating temperature of the stretching unit amounts to at least 200° C. or at least 300° C. or at least 400° C.   
     
     
         13 . A stretching unit, comprising a guide rail and at least one measuring gripper unit according to  claim 1 , wherein the measuring gripper unit is guided on the guide rail by means of the guide element. 
     
     
         14 . The stretching unit according to  claim 13 , further comprising at least one magnet, said magnet being located in the region of said at least one guide rail, and wherein
 the measuring gripper unit is configured to detect a magnet field of at least one magnet at a point of time, at said point of time the measuring gripper unit is guided past the magnet on the guide rail.   
     
     
         15 . The stretching unit according to  claim 13 , wherein the stretching unit comprises at least one receiving unit, said receiving unit being configured to receive measurement data from the measuring gripper unit, wherein the receiving unit is arranged outside of a stretching oven. 
     
     
         16 . The stretching unit according to  claim 13 , wherein
 the stretching unit comprises different types of measuring gripper units, wherein a first type is configured to capture a first measurement data type and a second type to capture a second measurement data type, and wherein the first and the second measurement data types differ.   
     
     
         17 . A method for capturing measurement data in a stretching unit, wherein the method comprises the following:
 arrangement of at least one measuring gripper unit according to  claim 1  on a guide rail of a stretching unit;   guiding of said at least one measuring gripper unit along the guide rail, wherein the measuring gripper unit optionally clamps a material web;   capturing measurement data by means of a measuring gripper unit; and   storing and/or wireless sending of the captured measurement data, wherein the sending occurs during and/or after the guiding.   
     
     
         18 . The method according to  claim 17 , further comprising
 an assignment of the captured measurement data to a position on a guide rail of the stretching unit, and/or   control of the stretching unit based on the captured measurement data.